package com.he1618;

public class StrApp {

    public static void main(String[] args) {

        System.out.println("531342602878920231129000067166".length());

        String billNo="531342602878920231129000067166";
        if (billNo.startsWith("5")){
            billNo=1+billNo.substring(1);
            System.out.println(billNo);
        }
        System.out.println(billNo.startsWith("5"));
        System.out.println(billNo.startsWith("4"));
        System.out.println(billNo.startsWith("3"));
        System.out.println(billNo.startsWith("2"));
        System.out.println(billNo.startsWith("1"));

    }
}
